Perforating Casing Collar Locator is a depth correction and positioning tool used in oil logging. The core function is to achieve precise measurement and correction of downhole depth through the detection and analysis of magnetic signals. This type of instrument has strong anti-interference ability and stability in complex downhole environments, and can effectively cope with the influence of environmental factors such as vibration and shock.
Features & Advantages
◆ Exceptional Shock & Vibration Resistant Performance
It can operate stably under the extreme vibrations and pressure shocks generated by perforating bomb explosions and drilling and grinding operations without damage or performance degradation.
◆ High Precision & High Resolution
It can generate clear and sharp electrical pulse signals, enabling the precise positioning of the coupling position to the centimeter level and providing an accurate depth reference for subsequent operations.
◆ Sturdy Structure & High Reliability
The original design intention is for harsh working conditions, the mean time between failures is long and the operation risk is low.
◆ Strong Compatibility
The outer diameter of the tool is relatively small, allowing it to be lowered into the casing through an oil pipe (through the oil pipe operation), and it can be combined and connected in series with other production logging or perforation tools.
A-One Oil Perforating Casing Collar Locator
How Does A Perforating Casing Collar Locator Work?
The Perforating Casing Collar Locator working principle is based on electromagnetic induction, and the specific process is as follows:
Step 1: Establish A Magnetic Field
There is a strong permanent magnet inside the tool. When entering the well, this magnet will magnetize the surrounding casing string, causing the casing to be magnetized locally and creating a relatively stable magnetic field environment.
Step 2: Detect Changes in the Magnetic Circuit
There is also an induction coil in the tool, wound around an iron core with high magnetic permeability. When the tool moves at a constant speed inside the sleeve, due to the uniform thickness and magnetic properties of the sleeve body, the surrounding magnetic field remains stable, and the magnetic flux in the coil remains unchanged. So, no signal is generated.
Step 3: Identify the Coupling & Generate A Signal
When the tool passes through the coupling, due to the significant increase in the volume and thickness of the metal at the coupling compared to the sleeve body, the magnetic resistance at this location changes, causing severe disturbances in the magnetic field around the tool (alterations in the distribution of magnetic field lines).
1, This changing magnetic field will generate an induced electromotive force (voltage pulse) in the induction coil.
2, The thicker the coupling is, the stronger the signal pulse will be generated.
Step 4: Signal Processing & Deep Correlation
1, The generated electrical signals are transmitted in real time to the ground system through cables.
2, The ground system received this clear pulse signal.
3, The system precisely matches the time point when the pulse signal appears with the depth recorded in real time by the depth measurement system (DMS).
4, Ultimately, it is displayed as a sharp "spike" on the logging curve, and each spike represents a coupling and its corresponding precise depth.
The entire process can be compared to
In a pitch-dark tunnel (casing), there is a distinct metal bulge (coupling) on the wall at regular intervals. You hold a magnet and a coil (tool) and move forward at a constant speed. It's usually very stable and the coil doesn't respond. Every time it passes a protrusion, the magnet's sensation suddenly changes, and the coil "clunk" to generate an electrical signal. If you record the location of each "click", you will get an accurate map of the entire tunnel.
Conclusion Of Perforating Casing Collar Locator
|
Item |
Key Points |
|
Role |
The "cornerstone" and "control point" of deep control. Provide absolute and reliable depth references for all downhole operations |
|
Core Capability |
Under extreme vibration and shock (such as perforation explosion), it can still accurately detect the depth of the casing coupling. |
|
Operating Principle |
Based on electromagnetic induction. The change in the thickness of the metal at the coupling causes a magnetic field disturbance, generating an induced voltage pulse in the coil and associating it with the depth system. |
|
Values |
Ensure the safety and accuracy of operations It has avoided major engineering accidents and economic losses caused by depth errors. |
In conclusion, the Perforating Casing Collar Locator is a technology that seems simple but is actually crucial. It serves as a bridge connecting the positions of downhole tools with the depth of surface geological models, and it is the core technical guarantee for ensuring the safe and efficient conduct of various high-risk and high-precision underground operations.
Welcome to contact us to learn more about our tools via e-mail info@a-oneoil.com
